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Proceedings Paper

Nanophotonic light trapping in polycrystalline silicon thin-film solar cells using periodically nanoimprint-structured glass substrates
Author(s): Christiane Becker; Jolly Xavier; Veit Preidel; Philippe Wyss; Tobias Sontheimer; Bernd Rech; Jürgen Probst; Christoph Hülsen; Bernd Löchel; Alexei Erko; Sven Burger; Frank Schmidt; Franziska Back; Eveline Rudigier-Voigt
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Paper Abstract

A smart light trapping scheme is essential to tap the full potential of polycrystalline silicon (poly-Si) thin-film solar cells. Periodic nanophotonic structures are of particular interest as they allow to substantially surpass the Lambertian limit from ray optics in selected spectral ranges. We use nanoimprint-lithography for the periodic patterning of sol-gel coated glass substrates, ensuring a cost-effective, large-area production of thin-film solar cell devices. Periodic crystalline silicon nanoarchitectures are prepared on these textured substrates by high-rate silicon film evaporation, solid phase crystallization and chemical etching. Poly-Si microhole arrays in square lattice geometry with an effective thickness of about 2μm and with comparatively large pitch (2 μm) exhibit a large absorption enhancement (A900nm = 52%) compared to a planar film (A900nm ~ 7%). For the optimization of light trapping in the desired spectral region, the geometry of the nanophotonic structures with varying pitch from 600 nm to 800 nm is tailored and investigated for the cases of poly-Si nanopillar arrays of hexagonal lattice geometry, exhibiting an increase in absorption in comparison to planar film attributed to nanophotonic wave optic effects. These structures inspire the design of prospective applications such as highly-efficient nanostructured poly-Si thin-film solar cells and large-area photonic crystals.

Paper Details

Date Published: 25 September 2013
PDF: 9 pages
Proc. SPIE 8824, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV, 88240D (25 September 2013); doi: 10.1117/12.2023871
Show Author Affiliations
Christiane Becker, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Jolly Xavier, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Veit Preidel, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Philippe Wyss, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Tobias Sontheimer, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Bernd Rech, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Jürgen Probst, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Christoph Hülsen, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Bernd Löchel, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Alexei Erko, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
Sven Burger, Zuse Institute Berlin (Germany)
Frank Schmidt, Zuse Institute Berlin (Germany)
Franziska Back, SCHOTT AG (Germany)
Eveline Rudigier-Voigt, SCHOTT AG (Germany)


Published in SPIE Proceedings Vol. 8824:
Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion IV
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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